Quiz exercises: Fix stuck loading cycle for competency selector in quiz exercise edit view

[MaximilianAnzinger]

Checklist

General

• I tested all changes and their related features with all corresponding user types on a test server.
• This is a small issue that I tested locally and was confirmed by another developer on a test server.
• I chose a title conforming to the naming conventions for pull requests.

Client

• Important: I implemented the changes with a very good performance, prevented too many (unnecessary) REST calls and made sure the UI is responsive, even with large data.
• I followed the coding and design guidelines.
• I added multiple integration tests (Jest) related to the features (with a high test coverage), while following the test guidelines.
• I documented the TypeScript code using JSDoc style.

Motivation and Context

Description

Steps for Testing

Prerequisites:

• 1 Instructor
• 1 Course WITHOUT Competencies

1. Log in to Artemis
2. Navigate to Course Administration
   For each Exercise type:
3. Create Exercise
4. Check if you see a loading animation for the competency selector. Either the selector disappears after a short time OR it disappeared so quickly you didn't have time to see it. Both cases are fine.
5. Continue with the next Exercise type (step 3.) until all are covered

Testserver States

Note

These badges show the state of the test servers.
Green = Currently available, Red = Currently locked

Review Progress

Performance Review

• I (as a reviewer) confirm that the client changes (in particular related to REST calls and UI responsiveness) are implemented with a very good performance

Code Review

• Code Review 1
• Code Review 2

Manual Tests

• Test 1
• Test 2

Test Coverage

Client

Class/File	Line Coverage	Confirmation (assert/expect)
competency-selection.component.ts	88.63%	✅

Screenshots

[JanaNF]

Manual tested on legacy_ts2. Worked as expected

[xHadie]

Manually tested on TS2_Legacy
LGTM - Works as you described.

[JohannesStoehr]

Code

[sarpsahinalp]

Tested on ts2. Seems to be working

[FiasKr]

Tested on Legacy TS3, seems to be working fine :)

[MaximilianJG]

Everything worked as expected. I cannot see the competency selector and also no competency selector loading animation when creating the different exercises